An injury to Ousmane Dembele has allowed him a run in the team recently, though, and he responded with a wonder strike from 25 yards against United as Barca reached a European semifinal for the first time since 2015.

CHAMPIONS LEAGUE

They will face Coutinho's former club, Liverpool, in the last four, with the first leg at Camp Nou on May 1 and the return game at Anfield six days later.

"Players feed off confidence in the same way everyone else does and when they get things right, when they play well, that confidence grows quickly," Valverde said in a news conference on Friday.

"They then have confidence which maybe at other moments [in the season] they didn't have. We're all exposed to criticism and praise continuously [at Barcelona] and Coutinho's the same as everyone else."

Coutinho, who has now scored 11 goals in all competitions this season, has clearly been affected by the criticism. After scoring in midweek, he cupped his hands to his ears in frustration in front of the home end.

"It's true he made a gesture [to the fans] when he scored, but it surprises me that we're talking about that more than a great goal in a Champions League quarterfinal," the coach said.

"[The celebration] didn't seem anything special to me or a lack of respect towards anyone. We give too much importance to these things.

"It's normal that he's been criticised because we're at a club where the demands are so high. There are always different spells during a season, but the other day he played really well, scored a great goal and that's what I took from the game."

Before facing Liverpool, Barca have three league games in a week, starting at home against Real Sociedad on Saturday. They then travel to Alaves before hosting Levante next weekend. Three wins would seal an eighth league title in 11 years with three games to spare.

"We would love to get nine points and mathematically wrap up the championship," Valverde said. "We're getting closer to our goals but you can't mess up now.

"The dressing room is very aware of the moment of the season we're in. It's not like in November, when maybe a Champions League game takes all the focus. We're playing for La Liga and the game against La Real's another important one. We all know that and so do our supporters."

Barca have no major injury concerns ahead of the Basque side's visit. Samuel Umtiti missed training earlier in the week but Valverde played down suggestions the defender's knee injury has flared up again.